If the casino gambling pays you off better than your reliable source of income is today, would you concentrate more and give more of your times and funds to the casino? Or you would keep having the gambling board merely for funs as it maybe?
Remember it pays off more than your source of income probably it could be an alternative reliable source of income for you.
That's a weird hypothetical OP.
The entire concept of casinos are to make profit of gamblers, meaning they have to have the edge over player, otherwise the business would collapse very quickly.
When you say "reliable" I understand you're not talking about getting lucky few times and making a profit, but you mean a situation when a player can expect to win as he has a mathematical advantage on his side?
Even if that was the case, it would not be sustainable. Sooner or later the casino would discover there is some exploit going on and you'd get cut off from that income stream.